Key result
Bethanidine sulphate alters K+ currents, hyperpolarizes resting membrane potential, and relaxes vascular smooth muscle.
Why the study?
The effects of bethanidine on different types of potassium currents and vascular smooth muscle relaxation were investigated to understand its vasodilatory mechanism.
Does bethanidine alter K+ currents and relax vascular smooth muscle in rabbit aorta cells?
Population
Single vascular smooth muscle cells of rabbit aorta in culture
Comparison
Bethanidine sulphate (10(-4)M) vs baseline and tetraethylammonium
Design
Whole-cell voltage-clamp electrophysiological study
Authors
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Hypothesis-generating for vasodilatory K+ modulation in animals; leaves open human translation and clinical relevance.
Does bethanidine alter K+ currents and relax vascular smooth muscle in rabbit aorta cells?
Bethanidine acts as a vasodilator by activating a delayed rectifier K+ current that hyperpolarizes the resting membrane potential in vascular smooth muscle.
Bkaily et al. (1988) studied this question. Bethanidine sulphate was evaluated on K+ currents, resting membrane potential, and vascular smooth muscle relaxation. Bethanidine sulphate decreased the early outward K+ current, increased the delayed rectifier K+ current, hyperpolarized the resting membrane potential, and relaxed vascular smooth muscle.
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